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2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology最新文献

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A preliminary study of a novel approximate UTD ray solution of an oblique EM diffraction by an impedance discontinuity in a planar surface 平面上阻抗不连续的斜位电磁衍射新近似UTD射线解的初步研究
Montree Saowadee, T. Lertwiriyaprapa, S. Chalermwisutkul
This paper presents a preliminary study of a novel approximate UTD ray solution of an oblique electromagnetic (EM) diffraction by an impedance discontinuity in a planar surface. The proposed solution is heuristically obtained from the Weiner-Hopf (W-H) solution. This leads the proposed solution relatively simple and closed form expression which is suitable for engineering applications. The comparison between the proposed solution and the W-H solution also preformed and shows good agreement for all the co and cross-polarizations.
本文提出了一种利用平面上阻抗不连续的斜向电磁衍射的近似UTD射线解的新方法。提出的解是由Weiner-Hopf (W-H)解启发式得到的。这使得所提出的解决方案相对简单和封闭的形式表达式,适合于工程应用。将所提出的溶液与W-H溶液进行了比较,结果表明所有的共极化和交极化都很吻合。
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引用次数: 2
Robust local obstacle avoidance for mobile robot based on Dynamic Window approach 基于动态窗口方法的移动机器人鲁棒局部避障
Piyapat Saranrittichai, N. Niparnan, A. Sudsang
To travel within the real world safely, an autonomous mobile robot has to perform obstacle avoidance. One of the most popular approaches to solve local obstacle avoidance is Dynamic Window approach. This approach is to search optimal control command of the robot in velocity space directly. The command which maximizes objective function is then selected as output command. In the original Dynamic Window approach, in order to avoid obstacles, it concerns only obstacles on robot's trajectory. Therefore, the robot might crash with some obstacles which are near the trajectory but not on the trajectory. Therefore, in this work, we propose field Dynamic Window approach (F-DWA) which objective function is modified to consider the obstacles near the trajectory as well. This can be done by the use of histogram grid representation of obstacles to estimate the crashing probability of the trajectory. The objective function of Dynamic Window approach also depends on the crashing probability as well as other traditional factors. To test the robustness of proposed algorithm, experiment in real world is conducted. The result is the robot can travel safer when it concerns near-trajectory obstacles.
为了在现实世界中安全行驶,自主移动机器人必须进行避障。动态窗口法是解决局部避障问题最常用的方法之一。该方法是直接在速度空间中搜索机器人的最优控制命令。然后选择使目标函数最大化的命令作为输出命令。在原来的动态窗口方法中,为了避免障碍物,它只关注机器人轨迹上的障碍物。因此,机器人可能会与一些靠近轨迹但不在轨迹上的障碍物发生碰撞。因此,在本研究中,我们提出了场动态窗口方法(F-DWA),该方法对目标函数进行了修改,同时考虑了轨迹附近的障碍物。这可以通过使用障碍物的直方图网格表示来估计轨迹的碰撞概率来实现。动态窗口法的目标函数还取决于碰撞概率以及其他传统因素。为了验证所提算法的鲁棒性,进行了实际实验。结果是,当机器人遇到近轨道障碍物时,它可以更安全地行驶。
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引用次数: 40
Analysis of electrical stress on power circuit breaker from capacitor banks switching 电容器组开关对电力断路器的电应力分析
T. Suwanasri, C. Suwanasri, Sumate Lipirodjanapong, S. Wattanawongpitak
This paper presents the simulation of capacitor bank switching to evaluate the electrical stress to power circuit breaker. The electrical stress consists of inrush current during closing as well as transient recovery voltage and rate of rise of recovery voltage during opening. The studied cases are base case with ideal voltage source, practical system representing the system by several elements and three phase practical switching including the pole discrepancy among circuit breaker poles during closing and opening. The obtained result will be used to as a guideline for specification and procurement of power circuit breaker using in Thailand electrical network.
本文通过对电容器组开关的仿真来评估电源断路器的电应力。电应力包括合闸时的涌流、瞬态恢复电压和开闸时恢复电压的上升速率。研究了具有理想电压源的基本情况、由多个元件组成的实际系统和三相实际开关,包括断路器合闸和分闸时的极差。所得结果将作为泰国电网电力断路器规格和采购的指导。
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引用次数: 4
ATC based optimal power flow for contingent power systems using differential evolution 基于ATC的差分演化应急电力系统最优潮流
C. Cholsuk, P. Pao-la-or, T. Kulworawanichpong
In this paper, optimal power flow based on available transfer capability (ATC) has been proposed for contingent power systems. In general, the total production cost is commonly used as the main objective for optimal power flow problems. However, in some circumstances, where the economical point of views is less important such as under an emergency state of partial blackout, the transmission security objective e.g. ATC is very useful. Maximizing the ATC implies to reduce probability of wide area blackout as a consequence. This paper performs contingency analysis of the power system. After an occurrence of some specific component failure, an ATC based optimal power flow problem has been formulated and solved by differential evolution (DE) method. To illustrate its use, the standard IEEE 14-bus test system was tested.
本文提出了基于可用输电能力(ATC)的备用电力系统最优潮流。一般来说,总生产成本通常被用作最优潮流问题的主要目标。然而,在某些情况下,在经济角度不太重要的情况下,例如在局部停电的紧急状态下,传输安全目标(例如ATC)是非常有用的。最大化ATC意味着减少大面积停电的可能性。本文对电力系统进行了应急分析。在某一特定部件发生故障后,提出了一种基于ATC的最优潮流问题,并用差分进化方法求解。为了说明它的使用,对标准IEEE 14总线测试系统进行了测试。
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引用次数: 0
Robustness of 3D indoor localization based on fingerprint technique in wireless sensor networks 无线传感器网络中基于指纹技术的室内三维定位鲁棒性研究
Thanapong Chuenurajit, Sisongkham Phimmasean, P. Cherntanomwong
The simple approaches of an indoor localization have been continuously developed and extensively published. In order to achieve a challenge of the effective indoor localization, the expected localization system should be a high efficiency such as high accuracy, simple, robustness and effective system. For the indoor localization, the researches have been supported by the advancement of the sensor node technology. One application of this technology is wireless sensor networks-based indoor localization. The simple approaches of 2-dimensional (2D) indoor localization have been widely proposed. Since a realistic system includes complicated terrain and different environment, 3-dimensional (3D) consideration is more suitable to be applied in the real life. This paper proposes an approach of 3D indoor localization based on ZigBee standard. Fingerprint technique-based received signal strength indicator (RSSI) is employed. Due to fluctuating signals in indoor environment, robustness of fingerprint technique will be proposed in order to solve the propagation mechanisms. The k-Nearest Neighbor using Euclidean distance is utilized as the pattern matching algorithm. For the case study, 8 reference nodes and 1 target node are stationary placed on a bookshelf in clean and human body's effect environments. The expected errors of estimated target locations should not be more than 36 cm (each level height). From the results, we can acquire an acceptable accuracy. It shows that our system can be applied in the real application.
室内定位的简单方法一直在不断发展和广泛发表。为了实现有效的室内定位的挑战,期望的定位系统应该是一个高精度、简单、鲁棒和有效的系统。对于室内定位,传感器节点技术的进步为研究提供了支撑。该技术的一个应用是基于无线传感器网络的室内定位。室内二维定位的简单方法已被广泛提出。由于现实系统包含复杂的地形和不同的环境,因此三维(3D)考虑更适合应用于现实生活中。提出了一种基于ZigBee标准的室内三维定位方法。采用基于指纹技术的接收信号强度指示器(RSSI)。由于室内环境中信号波动较大,为了解决其传播机制,提出了指纹技术的鲁棒性。利用欧几里得距离的k近邻作为模式匹配算法。在案例研究中,8个参考节点和1个目标节点固定放置在书架上,处于清洁和人体效应环境中。估计目标位置的预期误差不应超过36厘米(每层高度)。从结果来看,我们可以获得一个可以接受的精度。结果表明,该系统可以在实际应用中得到应用。
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引用次数: 15
Robust stabilizing modified repetitive controllers for multiple-input/multiple-output time-delay plants with specified input-output characteristic 具有特定输入输出特性的多输入/多输出时滞对象鲁棒稳定改进重复控制器
Zhongxiang Chen, Yun Zhao, T. Sakanushi, S. Tohnai, K. Yamada
The modified repetitive control system is a type of servomechanism for a periodic reference input. When modified repetitive control design methods are applied to real systems, the influence of uncertainties in the plant must be considered. In some cases, uncertainties in the plant make the modified repetitive control system unstable, even though the controller was designed to stabilize the nominal plant. Recently, Chen et al. proposed the parameterization of all robust stabilizing modified repetitive controllers for multiple-input/multiple-output time-delay plants. However, using their method, it is complex to specify the low-pass filter in the internal model for the periodic reference input of which the role is to specify the input-output characteristic. Because, the low-pass filter is related to four free parameters in the parameterization. To specify the input-output characteristic easily, this paper proposes the parameterization of all robust stabilizing modified repetitive controllers for multiple-input/multiple-output time-delay plants with specified input-output characteristic such that the input-output characteristic can be specified beforehand.
修正重复控制系统是一种周期参考输入的伺服机构。将改进的重复控制设计方法应用于实际系统时,必须考虑对象不确定性的影响。在某些情况下,对象的不确定性使修改后的重复控制系统不稳定,即使控制器被设计为稳定标称对象。最近,Chen等人提出了多输入/多输出时滞对象的所有鲁棒稳定修正重复控制器的参数化。然而,使用他们的方法,为周期参考输入指定内部模型中的低通滤波器是复杂的,其作用是指定输入-输出特性。因为低通滤波器与参数化中的四个自由参数有关。为了方便地确定输入输出特性,本文提出了具有指定输入输出特性的多输入/多输出时滞对象的所有鲁棒稳定修正重复控制器的参数化方法,使得输入输出特性可以预先确定。
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引用次数: 0
Simplified multiple object tracking model for real-time intelligent surveillance system 简化了实时智能监控系统的多目标跟踪模型
W. Won, Man-Won Hawng, Yong-Seok Kim, Dong-Uk Kim
In this paper, we propose detection based simplified multiple object tracking model with handling stationary object detection and occlusion problem for real-time intelligent surveillance system. In order to solve detection of slow and stationary object problem in Gaussian Mixture Model(GMM) based adaptive background model, we presents controlling learning rate mechanism using tracked region information. And, the simple primitive multi-features are applied for real-time multiple object tracking. As well, we proposed modified moving average filter for predicting next position of moving object to handle occlusion problems. Computational and real-target experiment results show that the proposed model can successfully track moving object within 45ms per frame for 640×480 image size on Intel® Core(TM) i7 CPU 1.6GHz in a real indoor scene including occlusion situation.
本文提出了一种基于检测的简化多目标跟踪模型,该模型处理了实时智能监控系统中静止目标的检测和遮挡问题。为了解决基于高斯混合模型(GMM)的自适应背景模型中慢静止目标的检测问题,提出了利用跟踪区域信息控制学习率的机制。将简单的原语多特征应用于实时多目标跟踪。同时,我们提出了改进的移动平均滤波器来预测运动目标的下一个位置,以解决遮挡问题。计算和实目标实验结果表明,在包含遮挡的真实室内场景中,在Intel®Core(TM) i7 CPU 1.6GHz上,该模型可以在45ms /帧内成功地跟踪到640×480图像大小下的运动目标。
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引用次数: 1
Police Eyes: Real world automated detection of traffic violations 警察的眼睛:真实世界的自动检测交通违规
Ramesh Marikhu, J. Moonrinta, M. Ekpanyapong, M. Dailey, S. Siddhichai
Dangerous lane changing, illegal overtaking, and driving in the wrong lane account for a high percentage of the total accidents that occur on the road, second only to accidents due to over-speeding. Automated traffic applications typically encompass the detection and segmentation of moving vehicles as a crucial process. Background subtraction and shadow detection are amongst the most challenging tasks involved in the segmentation of foreground blobs in dynamic environments. An effective balance between accuracy and speed is required to process a continuous feed of high resolution images from multiple cameras. Police Eyes is a mobile, real-time traffic surveillance system we have developed to enable automatic detection of traffic violations. Police Eyes would be useful to police for enforcing traffic laws and would also increase compliance with traffic laws even in the absence of police. The system detects illegal crossings of solid lines using image processing and efficient computer vision techniques on image sequences acquired from IP cameras. The automatic solid line crossing detection system can be used at locations where the traffic violations are notoriously high and are known to create traffic congestion and avoidable accidents. The system can be installed on an embankment, at an intersection area, at a lane change restriction area, at a no parking area or anywhere there is an observed pattern of drivers intentionally violating traffic laws. We have installed the system in an industrial grade embedded PC and deployed it in a police mannequin. Results of an empirical field evaluation show that the system performs well in a variety of real-world traffic scenes.
危险变道、违章超车、错道行驶在道路交通事故中所占的比例很高,仅次于超速事故。自动交通应用通常包括移动车辆的检测和分割作为一个关键的过程。背景减法和阴影检测是动态环境中前景斑点分割中最具挑战性的任务。处理来自多个摄像机的连续高分辨率图像需要在精度和速度之间取得有效的平衡。“警察之眼”是我们开发的移动实时交通监控系统,可自动检测交通违规行为。警察的眼睛对警察执行交通法规是有用的,即使在没有警察的情况下,也会增加对交通法规的遵守。该系统利用图像处理和高效的计算机视觉技术对从IP摄像机获取的图像序列进行检测,以检测非法越过实线。自动实线交叉检测系统可用于交通违例率极高的地方,以及众所周知会造成交通拥堵和本可避免的事故的地方。该系统可以安装在路堤、十字路口、车道变化限制区域、禁止停车区域或任何观察到司机故意违反交通法规的地方。我们已经将该系统安装在工业级嵌入式PC中,并将其部署在警察模型中。现场经验评估结果表明,该系统在各种现实交通场景中表现良好。
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引用次数: 13
UWB microstrip antenna based on circular patch with wing stub loaded and Defect Ground Structure 基于翼段加载圆形贴片和缺陷接地结构的超宽带微带天线
M. M. Sulaiman, M. Ali, I. Pasya, N. Ramli, H. Alias
A compact Ultra Wideband (UWB) microstrip antenna consists of a circular patch added with a three different length of open-end stub loaded Wing and partial ground plane with dumbbell shape defected ground structure (DGS) is proposed in this paper. This antenna was an improvement from the previous research, marked size reduction of 25% of the antenna size with comparable performance. The introduction of the DGS technique enables improvements in terms of bandwidth, gain and return loss characteristics. Using the model of transmission line based on 50Ω characteristic impedance, this antenna obtained a 10 dB return loss bandwidth from 3.21 GHz to 11.92 GHz.
本文提出了一种紧凑的超宽带(UWB)微带天线,该天线由一个圆形贴片加上三个不同长度的开口短段加载翼和部分接地面(哑铃形缺陷地面结构)组成。这种天线是对先前研究的改进,在具有相当性能的情况下,天线尺寸减少了25%。DGS技术的引入使带宽、增益和回波损耗特性得到改善。采用基于50Ω特性阻抗的传输线模型,该天线在3.21 GHz ~ 11.92 GHz范围内获得了10 dB的回波损耗带宽。
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引用次数: 1
Design of three-phase line impedance stabilization networks for EMC pre-compliance testing laboratories EMC预合规测试实验室三相线路阻抗稳定网络的设计
V. Tarateeraseth
In this paper, the design procedure of three-phase line impedance stabilization networks (LISN) for EMC pre-compliance testing laboratories is proposed. The three-phase LISN schematics and the detail of its components are provided. Finally, the experimental results demonstrating the performances of proposed three-phase LISN are given.
本文提出了EMC预合规测试实验室三相线路阻抗稳定网络(LISN)的设计步骤。提供了LISN的三相原理图及其组件的详细信息。最后给出了实验结果,验证了所提出的三相LISN的性能。
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引用次数: 2
期刊
2013 10th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology
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